ELEMNTS: A Computer Program for the Generation of Orbital Elements from Satellite Injection Data.

Program ELEMNTS provides initial conditions appropriate to satellite orbit codes from a set of injection conditions. The injection data supplied to ELEMNTS must include the radius of apogee and perigee, latitude and longitude of the injection point, the inclination of the orbit, the direction of injection, and the time of injection. Computed from the injection conditions are the Classical Keplerian element set and the initial position and velocity vectors in a space inertial frame. Several other quantities of general interest to the user are also computed. ELEMNTS assumes that the perigee point and the injection point are at the same place. The program also assumes that the injection time is between the years 1900 and 2000. A sample problem and a complete listing of the program written in American National Standards Institute FORTRAN is included in this report.